NATURAL HISTORY SURVEY 129 



Spines slender, scarcely a millimeter long, crowded, white, 

 becoming fuscous. 



River Forest. Common. 

 Hydnum Nyssae B. & C. 



Subiculum effused, copiously pulverulent, alutaceous. 



Spines long, crowded, subulate, acute, often pencilled at the 

 tip, concolorous. Effused for several centimeters with scarcely 

 any border. Spines pubescent with occasional long hairs at the 

 apex. 



On a rotten stump, Wasco. August. The subiculum has an 

 indefinite, pulverulent, whitish border. The long hairs found at 

 the tips of some of the spines are a peculiar character of the 

 species. 



Hydnum chryscomum Und. 



Resupinate, forming areas 2 to 6 cm. each way; mycelial 

 strands wide-creeping, more or less branched, bright orange- 

 yellow, expanding here and there to form a membranous subicu- 

 lum bearing the bright orange-yellow spines; subiculum thin, 

 whitish-fimbriate at the margin, yellowish within and later bright 

 orange-yellow. 



Spines crowded, 1 mm. or more long, often confluent so as to 

 appear flattened, terete when single, concolorous, rather obtuse. 



On the under side of a very rotten trunk in woods, Winfield. 

 September, 1900. The plant produces cord-like, branching 

 strands, a dm. or more in length, which ramify upon or within 

 the decaying wood, but are easily separable from it. These 

 strands are almost exactly the color of the rootlets of Toxi/lon 

 pomiferum. The membranous subiculum is composed of rather 

 coarse loosely interwoven threads, seceding from the matrix, the 

 byssine border indefinite. In November, 1902, the species was 

 found creeping extensively beneath the bark of a prostrate, de- 

 caying trunk of Quercus alba. These plants were sterile. Their 

 growth finally separates the bark from the wood. The mycelium 

 was not found upon or within the tissues of the bark, although it 

 ramified freely in the rotten wood beneath. 



Hydnum crinale Fr. 



Subiculum umber, effused, villous-interwoven, thin. 



Spines long, crowded, equal, very slender, umber. 



On the bark of a rotting log, woods, Riverside. October. 



IRPEX. 



Plants leathery or woody, pileate or resupinate; teeth concrete 

 with the pileus, arranged in rows like network, connected at the 

 base by folds which are lamellae-like (in sessile species), or re- 

 sembling honeycomb (in resupinate ones). Growing on wood. 



Plant effused-reflexed 1 



Plant wholly resupinate 2 



